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Chemical and Physical Papers. 53 



COMPOSITION OP GAS FROM COTTONWOOD TREES 

By P. W. Bushong. 

A BOUT ten years ago, while cutting down some cottonwood 
-^*- trees, the writer observed the formation of bubbles in 
the sap upon the freshly cut trunk, stump and chips. On ap- 
plying a lighted match the gas emitted proved to be combus- 
tible. In the latter part of July, 1907, gas was collected from 
a cottonwood tree in the following manner : 

An inch hole was bored into the trunk to the heart. A piece 
of gas-pipe provided with a stopcock was screwed tightly into 
this hole. A rubber tube conveyed the gas from the stopcock 
to a bottle previously filled with distilled water and inverted 
in a dish of distilled wat^r. Two bottles of gas, about four 
liters, were collected and used for preliminary experiments, 
but were not used for analysis because they contained the air 
originally in the gas-pipe, etc. A third bottle of gas was re- 
served for the analysis, which was made November 27, 1907, 
with the following average results from two complete and 
two partial analyses by Professor McFarland: 

Oxygen, 2 1.24 

Carbon dioxid, C0 2 7.21 

defines (ethylene) , etc., C 2 H< 0.00 

Carbon monoxid, CO 0.00 

(One determination gave 0.5 per cent.) 

Hydrogen, H 2 0.00 

Methane (marsh gas) , CH 4 60.90 

Ethane, etc., C 2 H« 0.00 

Nitrogen, etc., by difference, N 2 30.65 

Total 100.00 

Nitrogen residue as actually determined, N 2 30.01 

University of Kansas, Lawrence, November 27, 1907.